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Related Concept Videos

Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies01:22

Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies

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The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
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Rheumatic Heart Disease I: Introduction01:23

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Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...
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Myocarditis II: Clinical Features and Diagnostic Tests01:27

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Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...
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Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased...
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Lysogenic Cycle of Bacteriophages00:43

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In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
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Related Experiment Video

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Detecting the Lyme Disease Spirochete, Borrelia Burgdorferi, in Ticks Using Nested PCR
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Lyme disease.

J Evans1

  • 1Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520-8031, USA.

Current Opinion in Rheumatology
|July 20, 1999
PubMed
Summary
This summary is machine-generated.

Lyme disease (LD) is a growing concern in the US, with increasing cases and complex presentations. Research indicates a new Lyme vaccine is safe and effective for adults.

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Area of Science:

  • Infectious Diseases
  • Epidemiology
  • Tick-Borne Illnesses

Background:

  • Lyme disease (LD) is the most prevalent tick-borne illness in the U.S., with a documented rise in reported cases since 1982.
  • Co-infections with Borrelia burgdorferi and other pathogens carried by Ixodes ticks are common, but their clinical impact remains unclear.
  • Unusual clinical presentations and potential autoimmune involvement in chronic Lyme arthritis expand the understanding of LD's spectrum.

Purpose of the Study:

  • To summarize the current understanding of Lyme disease epidemiology, clinical manifestations, and potential therapeutic interventions.
  • To review the impact of co-infections on the clinical course of Lyme disease.
  • To assess the safety and efficacy of a novel recombinant Lyme vaccine.

Main Methods:

  • Surveillance data analysis from the Centers for Disease Control and Prevention (CDC).
  • Review of case reports detailing unusual presentations of Lyme disease.
  • Analysis of studies investigating erythema migrans-like rashes in the Southern U.S.
  • Examination of research on autoimmune processes in chronic Lyme arthritis.
  • Evaluation of results from two large, placebo-controlled trials of a recombinant Lyme vaccine.

Main Results:

  • Lyme disease incidence has steadily increased since 1982.
  • Co-infection impacts on LD clinical course require further investigation.
  • Erythema migrans-like rashes in the Southern U.S. may be linked to related spirochetes.
  • Chronic Lyme arthritis might involve autoimmune mechanisms.
  • A recombinant Lyme vaccine demonstrated safety and efficacy in preventing LD in adults.

Conclusions:

  • Lyme disease surveillance and research are crucial due to increasing incidence.
  • Further studies are needed to elucidate the role of co-infections and autoimmune factors in LD.
  • A new recombinant Lyme vaccine offers a promising preventive strategy for adults.